The existence of dark matter (DM) requires physics beyond standard model (SM). The so-called dark matter comprises approximately four fifths of the mass of the universe as manifested by its gravitational influence (e.g., [1]}). However, at the present time its other fundamental characteristics are still illusive. This is because, aside from its gravitational effects, no other definitive physical evidence of its nature has been found. In particular, severe limits on its interaction with standard model particles have been obtained in the laboratory [2]}–[3]}). This dark matter could well be in hidden sectors comprised of additional particles and forces [4]}. Such particles may have either minuscule or nonexistent interactions with SM particles.
